WACO (July 22, 2012)- Law enforcement officers across the country are starting to use the Colorado "Dark Knight Massacre," as a tool to train for future threats if they were to ever happen.

But some concealed handgun license instructors in Central Texas, are saying the shooting could have easily been prevented.

"Had that been a theater in here in Central Texas, I believe it would have had a different outcome," CHL Instructor Parnell McNamara said.

"I know a lot of people that carry here, more than you think, and would have been swapping lead with that coward," he said.

If you're a CHL holder in Texas, movie theaters aren't a listed prohibited place to carry a firearm.

However, many Texas theaters choose to be gun free and post 30.06 signs outside their ticket booths.

According to Texas3006.com, 29 theaters in Texas prohibit conceal and carry.

Twenty of those theaters belong to AMC, and many are in populated locations like Dallas, Houston, and San Antonio.

"Gun ban signs and 30.06 signs are only going to stop law abiding citizens...not the criminal...they love to see those signs." McNamara said.

Notable film critic, Rodger Ebert, referred to the shooting in his latest blog post:

"James Holmes is insane, but our gun laws are also insane. In theory, a citizen needs to defend itself. Not one single person at the theater shot back, yet the theory will still be defended."

The reason, however, why no one shot back is clear.

Cinemark, who owns the theater where the shooting occurred, has a gun free policy.

"One person with a CHL and a hand gun on their person could have stopped that threat, bottom line," CHL Instructor Johnny Price said.

"Think about it, one person could have saved 12 people," he said,

The 30.06 signs banning firearms vary from theater to theater in Central Texas.

All of the theaters in Waco allow you to conceal and carry into theaters.

Across the country, Law Enforcement officials say it's nearly impossible to prevent a mass shooting like the "Dark Knight Massacre."

But here on the home front, some would disagree.

"The mass shootings that have taken place are always in gun free zones, they don't happen where guns are allowed," Price said.